US4126891A - Switching regulator with feedback system for regulating output current - Google Patents
Switching regulator with feedback system for regulating output current Download PDFInfo
- Publication number
- US4126891A US4126891A US05/751,641 US75164176A US4126891A US 4126891 A US4126891 A US 4126891A US 75164176 A US75164176 A US 75164176A US 4126891 A US4126891 A US 4126891A
- Authority
- US
- United States
- Prior art keywords
- voltage
- signal
- output
- circuit
- producing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000001105 regulatory effect Effects 0.000 title description 8
- 238000004804 winding Methods 0.000 claims description 23
- 239000003990 capacitor Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 238000007792 addition Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
- H01J23/16—Circuit elements, having distributed capacitance and inductance, structurally associated with the tube and interacting with the discharge
- H01J23/165—Manufacturing processes or apparatus therefore
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/338—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in a self-oscillating arrangement
- H02M3/3385—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in a self-oscillating arrangement with automatic control of output voltage or current
- H02M3/3387—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in a self-oscillating arrangement with automatic control of output voltage or current in a push-pull configuration
Definitions
- This invention relates to a switching regulator, especially the type comprising a chopper circuit and a DC-DC converter.
- a conventional switching regulator serves the purpose of controlling DC output voltage by means of switching elements such as transistors which enable the ON/OFF operation of the pulse.
- the benefits of this system are a smaller loss of power, better performance, and compactness in design.
- An object of the present invention is to eliminate the above mentioned disadvantages.
- Another object of the present invention includes the combination of the chopper circuit.
- Another object is to obtain the synchronizing signals of the chopper circuit from the inverter of the DC-DC converter. This could be realized only after achieving the combination of the chopper circuit and the DC-DC converter.
- Another object of the present invention is to eliminate the isolator in the voltage feedback circuit installed between the chopper circuit and the DC-DC converter.
- Another object of the present invention is the addition of a detecting winding which detects at the output of the inverter in the DC-DC converter.
- a switching regulator which includes:
- a chopper circuit for receiving the output signal from the DC voltage source circuit and producing a first pulse signal which is smoothed by a low pass filter so as to obtain a first DC voltage at the output terminal thereof;
- a DC-DC converter circuit which at least includes an inverter circuit for receiving the first DC voltage of the chopper circuit and producing a second pulse signal which is rectified by a rectifier circuit so as to obtain a second DC voltage to be adapted to supply it to a load;
- FIG. 1 is a block diagram of the conventional switching regulator.
- FIG. 2 is a block diagram showing an embodiment of this present invention.
- FIG. 3 is an electrical circuit showing an example of a chopper circuit used in the switching regulation according to the present invention.
- FIG. 4 is an electrical circuit of a DC-DC converter used in the switching regulation according to the present invention.
- FIGS. 5a to 5e and FIGS. 5c' to 5e' show waveforms at various points in the above circuits to explain the performance of this invention.
- a conventional switching regulator (such as FIG. 1) supplies a DC signal to the switching circuit 2 after having rectified the AC input 1a in the rectifier circuit 1.
- This DC signal is switched and converted into an AC signal, which, while passing through the low pass filter 3, changes into DC.
- This DC voltage is applied to the inverter 4.
- the output of the inverter is rectified at the rectifier circuit 6 which is connected to the transformer 5, and the regulated DC voltage (not shown in the figure) is supplied to the load.
- the DC output insulates the primary and the secondary of the output transformer by an isolator 7, and feedback to the pulse width modulator 8 for the stabilization of the output voltage.
- the pulse width modulator 8 has connected thereto a pulse generator 9 to generate a triangular wave or sawtooth wave.
- a decrease or increase in the DC output voltage mentioned above affects the pulse and changes its width. This serves to supplement changes of the output voltage and make it possible to stabilize the DC output voltage.
- the conventional switching regulator like the one explained above, requires a pulse generator 9 which provides pulse width modulation. Also, a relatively expensive coupler is required to insulate the DC output of the rectifier circuit 6 from the pulse width modulator 8. Moreover, the DC output is supplied directly to the pulse width modulator 8, and this could cause variations in the operation of the feedback circuit.
- the present invention eliminates all of these inconveniences or performance defects of the conventional switching regulator.
- the present invention eliminates the need for the isolator and the pulse generator but still provides good voltage regulation.
- FIG. 2 is the block diagram showing one embodiment of the present invention.
- A is the chopper circuit
- B indicates the entire system of the DC-DC converter
- 10 indicates the rectifier circuit to rectify the AC input 10a
- 11 indicates the switching circuit to convert the output of the rectifier circuit to an AC signal
- 12 indicates the low pass filter
- 13 indicates the inverter
- 14 indicates the output transformer
- 15 indicates the rectifier circuit from which the regulated DC voltage output is obtained
- 16 is a winding for detecting feedback voltage which is different from the above mentioned secondary winding of the output transformer. Winding 16 serves to detect the output corresponding to variations of the output voltage and adds it to the pulse modulator 18 via the voltage feedback circuit 17.
- the output transformer 14 connected to the output side of the above-mentioned inverter 13 has a detecting winding 19 to detect the signals to synchronize with the inverter output.
- the detected synchronizing signals are applied to the pulse width modulator 18 via the synchronizing signal detector 20 equipped with an integral circuit and other systems.
- the switching time of the switching circuit 11 is controlled. This is the manner by which the regulated voltage DC output is obtained.
- the rectifier circuit 10, switching circuit 11, low pass filter 12, and pulse width modulator constitute the chopper circuit A.
- the inverter 13, output transformer 14 and the rectifier circuit 15 constitute the DC-DC converter B.
- FIG. 3 shows the chopper circuit A of FIG. 2.
- This chopper circuit A receives a DC output through the circuit rectifier 10 which rectifies the AC input.
- the DC output is connected into a constant DC output voltage via the switching circuit 11 and the low pass filter 12.
- the feedback voltage will be used by the detecting winding 16 of the output transformer 14 on the output side of the inverter 13 in order to control the switching circuit 11.
- the output signal of the inverter 13 is detected by the detecting winding 19, and that will be the switching signal for the chopper circuit A.
- the PWM signal to control the switching circuit 11 comprises the synchronizing signal and the feedback voltage; that is, the DC output (+Epc) obtained by rectifying the AC input is switched by Darlington-connected transistors Q1, Q2 and Q3, into an AC pulse signal, and, after smoothing by low pass filter 12 consisting of choke coil L1 and capacity C1, is supplied to the inverter 13.
- the DC-DC converter B supplies a square wave pulse synchronizing signal (FIG. 5 (a)) to the base of one of the transistors Q4 and Q5 of the differential amplifier via an integrating circuit made of resistor R8 and capacity C2 (FIG. 5 (b)).
- the base of transistor Q5 gets output (FIG. 5 (c)) that is a sum of the feedback voltage of the return voltage detecting winding 16 and the triangular signal, such as the integrated output of the synchronizing signal.
- D1 shows the diode which permits a rapid flow of energy in the choke coil L1;
- D2 shows the Zener diode which establishes the reference voltage for the operation of transistor Q4;
- R6 and R7 show damping resistors of transistor Q4 and Q5;
- R1 shows the driving resistor of the chopper circuit A to place transistor Q4 ON when the power is being supplied.
- R2 shows the resistor which provides the Zener diode D2 with the driving current to make it operate properly.
- the output from the chopper circuit A such as the DC output of the low pass filter 12, is converted into AC by transistor Q6 and Q7, and generates the pulse voltage at the primary coil of the output transformer 14.
- the transistor Q9 of the starter S begins to operate.
- capacitor C7 is charged, and transistor Q8 is ON.
- driving coil L1 is energized, a control coil (one of the control coils L2 and L3 that are connected to transistors Q6, Q7) is energized, so that oscillation starts.
- the inverter continues to oscillate and generates square waves of pre-determined frequency in the circuit including coil L2 and L3 and capacitor C4 and C5. Its output is rectified by the rectifying circuit with diodes D5 and D8 and capacitors C9 and C10 via the secondary coil of the output transformer 14, and finally made into the DC output of the regulator voltage.
- the above-mentioned square wave output is supplied to the previously described feedback voltage detecting winding 16 and the synchronizing signal detecting winding 19. From the feedback voltage detecting winding 16, the DC voltage corresponding to the regulated DC output voltage is obtained in insulation from the DC output circuit through the rectifying circuit consisting of diodes D9 to D12 and capacitor C8. This DC voltage is supplied to the pulse width modulator 18 of the chopper circuit through the voltage return circuit.
- a synchronizing pulse corresponding to the frequency mentioned above is obtained and supplied to the pulse width modulator 18 through the synchronizing signal detection circuit.
- T1 shows the driving transformer and T2 shows the transformer for feedback of current.
- the follow up speed can be made variable.
- the voltage feedback loop is formed on the secondary side of the output transformer 14 (apart from the circuit which creates the regulated DC output voltage) through the detecting winding for the feedback voltage, and therefore the operation is stabilized against input variations on the secondary side.
- the voltage for the inverter 13 can be chosen so that the transistors Q6 and Q7 are used at a predetermined voltage. This also means that the system can be applicable to any power source and voltage.
- the chopper circuit has a switching circuit which is supplied with DC voltage and can be controlled by the output of the pulse width modulator.
- a DC-DC converter is connected to the chopper circuit and is equipped with an inverter, an output transformer, and a rectifier circuit for the supply of load voltage.
- a synchronizing signal detecting circuit detects a synchronizing signal from the output of the output transformer to synchronize the pulse modulator.
- a voltage feedback circuit is provided to control the pulse width according to a control voltage obtained by rectifying an output of the output transformer, the rectified output then being fed to the pulse width modulator.
- the need for an isolator such as a photo-coupler has been eliminated along with the square wave generator needed to accompany the system in the conventional switching regulator, also contributing to constancy of the regulated voltage against change in the AC input voltage.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Dc-Dc Converters (AREA)
- Control Of Electrical Variables (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP50153345A JPS5931306B2 (ja) | 1975-12-24 | 1975-12-24 | スイツチングレギユレ−タ |
JP50-153345 | 1975-12-24 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US05/936,055 Continuation-In-Part US4208706A (en) | 1975-12-24 | 1978-08-23 | Switching regulator |
Publications (1)
Publication Number | Publication Date |
---|---|
US4126891A true US4126891A (en) | 1978-11-21 |
Family
ID=15560433
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US05/751,641 Expired - Lifetime US4126891A (en) | 1975-12-24 | 1976-12-17 | Switching regulator with feedback system for regulating output current |
US05/936,055 Expired - Lifetime US4208706A (en) | 1975-12-24 | 1978-08-23 | Switching regulator |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US05/936,055 Expired - Lifetime US4208706A (en) | 1975-12-24 | 1978-08-23 | Switching regulator |
Country Status (8)
Country | Link |
---|---|
US (2) | US4126891A (nl) |
JP (1) | JPS5931306B2 (nl) |
AU (1) | AU508056B2 (nl) |
CA (1) | CA1097401A (nl) |
DE (1) | DE2658903A1 (nl) |
FR (1) | FR2336825A1 (nl) |
GB (1) | GB1558831A (nl) |
NL (1) | NL189891C (nl) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4160288A (en) * | 1978-05-17 | 1979-07-03 | Communications Satellite Corp. | Active filter circuit for regulated dc to dc power supplies |
US4251857A (en) * | 1979-02-21 | 1981-02-17 | Sperry Corporation | Loss compensation regulation for an inverter power supply |
US4291366A (en) * | 1979-09-24 | 1981-09-22 | Ncr Corporation | Switching regulated power supply |
US4535399A (en) * | 1983-06-03 | 1985-08-13 | National Semiconductor Corporation | Regulated switched power circuit with resonant load |
Families Citing this family (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI793821A (fi) * | 1978-12-13 | 1980-06-14 | Rca Corp | Avbrytande regleranordning med sjaelvstaendigt filter i aoterkopplingsvaegen |
US4302803A (en) * | 1980-01-16 | 1981-11-24 | Sperry Corporation | Rectifier-converter power supply with multi-channel flyback inverter |
US4556827A (en) * | 1980-04-17 | 1985-12-03 | General Electric Company | Laundering apparatus, method of operating a laundry machine, control system for an electronically commutated motor, method of operating an electronically commutated motor, and circuit |
US4513230A (en) * | 1980-04-17 | 1985-04-23 | General Electric Company | Laundering apparatus, method of operating a laundry machine, control system for an electronically commutated motor, and method of operating an electronically commutated motor |
JPS57152023A (en) * | 1981-03-13 | 1982-09-20 | Hitachi Ltd | Power supply for copying machine |
US4439821A (en) * | 1982-01-29 | 1984-03-27 | Varo, Inc. | DC to DC switching regulator with temperature compensated isolated feedback circuitry |
JPS58179176A (ja) * | 1982-04-13 | 1983-10-20 | Mitsubishi Electric Corp | インバ−タ |
GB8308100D0 (en) * | 1983-03-24 | 1983-05-05 | Rca Corp | Regulated power supply |
US4480297A (en) * | 1983-03-31 | 1984-10-30 | Sundstrand Corporation | Synchronizing circuit for push-pull inverter |
US4558230A (en) * | 1983-11-14 | 1985-12-10 | Rockwell International Corporation | High integrity dual input power supply |
US4686436A (en) * | 1984-07-06 | 1987-08-11 | General Electric Company | Electronic control circuit, electronically commutated motor system and method for controlling same, laundry apparatus, and methods for operating apparatus for switching high voltage DC and for controlling electrical load powering apparatus |
US4698742A (en) * | 1986-08-01 | 1987-10-06 | The United States Of America As Represented By The Secretary Of The Air Force | High-voltage milberger slip slide power conditioner |
NO873059L (no) * | 1987-07-22 | 1989-01-23 | Geir Ove Skjaervik | Dobbelt-svitsjet kraftforsyning. |
JPH01144361A (ja) * | 1987-11-30 | 1989-06-06 | Toshiba Corp | 電力供給装置 |
US4859921A (en) * | 1988-03-10 | 1989-08-22 | General Electric Company | Electronic control circuits, electronically commutated motor systems, switching regulator power supplies, and methods |
US5590033A (en) * | 1988-09-02 | 1996-12-31 | Yamaha Corporation | Power source apparatus |
DE3842465A1 (de) * | 1988-12-16 | 1990-06-28 | Flachenecker Gerhard | Schaltregler zur gleichspannungswandlung |
CA1316980C (en) * | 1988-12-27 | 1993-04-27 | Daniel C. Hughey | Power supply |
US7269034B2 (en) | 1997-01-24 | 2007-09-11 | Synqor, Inc. | High efficiency power converter |
DE10057315B4 (de) * | 2000-11-17 | 2004-11-18 | Kopetzki, Markus, Dipl.Ing. | Schaltungsanordnung zum potentialfreien Übertragen eines Messsignals sowie Trennverstärker in dem diese verwendet wird |
US9231481B2 (en) * | 2013-04-26 | 2016-01-05 | Motorola Solutions, Inc. | Power converter apparatus |
US10199950B1 (en) | 2013-07-02 | 2019-02-05 | Vlt, Inc. | Power distribution architecture with series-connected bus converter |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB826783A (en) * | 1957-03-19 | 1960-01-20 | Nat Res Dev | Electrical supply regulators |
US3122697A (en) * | 1960-07-20 | 1964-02-25 | Vector Mfg Company | Short circuit protective device |
US3551777A (en) * | 1968-12-26 | 1970-12-29 | Amp Inc | Inverter-converter with regulation of ac and dc outputs |
US3657631A (en) * | 1969-12-19 | 1972-04-18 | Int Standard Electric Corp | Converter circuits |
US3839668A (en) * | 1973-06-13 | 1974-10-01 | Bell Northern Research Ltd | Electronic converter with regulated output current and frequency |
US3967181A (en) * | 1970-05-06 | 1976-06-29 | Raytheon Company | Converter wherein switching frequency is independent of output voltage and is synchronized to an external system |
US4017787A (en) * | 1974-12-05 | 1977-04-12 | Nippon Electronics Memory Industry Co. Ltd. | Switching regulator having a load responsive alternate biasing circuit |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3237081A (en) * | 1961-10-23 | 1966-02-22 | Gulton Ind Inc | Power and voltage regulator circuit |
US3742330A (en) * | 1971-09-07 | 1973-06-26 | Delta Electronic Control Corp | Current mode d c to a c converters |
US3701937A (en) * | 1971-12-30 | 1972-10-31 | Bell Telephone Labor Inc | Pulse-width modulated dc to dc converter with zero percent duty cycle capability |
US3909695A (en) * | 1973-10-17 | 1975-09-30 | Hewlett Packard Co | Regulation and stabilization in a switching power supply |
US4061957A (en) * | 1975-02-04 | 1977-12-06 | Reinout Jan Vader | Electric energy conversion apparatus |
JPS51143832A (en) * | 1975-06-06 | 1976-12-10 | Sony Corp | Inverter |
US4034280A (en) * | 1975-06-09 | 1977-07-05 | Trw Inc. | Multiple high voltage output DC-to-DC power converter |
US4035710A (en) * | 1975-10-20 | 1977-07-12 | International Business Machines Corporation | Pulse width modulated voltage regulator-converter/power converter having means for improving the static stability characteristics thereof |
US4025862A (en) * | 1975-12-04 | 1977-05-24 | La Telemecanique Electrique | Power supply with chopping circuit |
-
1975
- 1975-12-24 JP JP50153345A patent/JPS5931306B2/ja not_active Expired
-
1976
- 1976-12-17 US US05/751,641 patent/US4126891A/en not_active Expired - Lifetime
- 1976-12-22 CA CA268,579A patent/CA1097401A/en not_active Expired
- 1976-12-22 AU AU20811/76A patent/AU508056B2/en not_active Expired
- 1976-12-22 GB GB53555/76A patent/GB1558831A/en not_active Expired
- 1976-12-22 NL NLAANVRAGE7614292,A patent/NL189891C/nl not_active IP Right Cessation
- 1976-12-23 FR FR7638939A patent/FR2336825A1/fr active Granted
- 1976-12-24 DE DE19762658903 patent/DE2658903A1/de active Granted
-
1978
- 1978-08-23 US US05/936,055 patent/US4208706A/en not_active Expired - Lifetime
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB826783A (en) * | 1957-03-19 | 1960-01-20 | Nat Res Dev | Electrical supply regulators |
US3122697A (en) * | 1960-07-20 | 1964-02-25 | Vector Mfg Company | Short circuit protective device |
US3551777A (en) * | 1968-12-26 | 1970-12-29 | Amp Inc | Inverter-converter with regulation of ac and dc outputs |
US3657631A (en) * | 1969-12-19 | 1972-04-18 | Int Standard Electric Corp | Converter circuits |
US3967181A (en) * | 1970-05-06 | 1976-06-29 | Raytheon Company | Converter wherein switching frequency is independent of output voltage and is synchronized to an external system |
US3839668A (en) * | 1973-06-13 | 1974-10-01 | Bell Northern Research Ltd | Electronic converter with regulated output current and frequency |
US4017787A (en) * | 1974-12-05 | 1977-04-12 | Nippon Electronics Memory Industry Co. Ltd. | Switching regulator having a load responsive alternate biasing circuit |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4160288A (en) * | 1978-05-17 | 1979-07-03 | Communications Satellite Corp. | Active filter circuit for regulated dc to dc power supplies |
US4251857A (en) * | 1979-02-21 | 1981-02-17 | Sperry Corporation | Loss compensation regulation for an inverter power supply |
US4291366A (en) * | 1979-09-24 | 1981-09-22 | Ncr Corporation | Switching regulated power supply |
US4535399A (en) * | 1983-06-03 | 1985-08-13 | National Semiconductor Corporation | Regulated switched power circuit with resonant load |
Also Published As
Publication number | Publication date |
---|---|
AU2081176A (en) | 1978-06-29 |
DE2658903C2 (nl) | 1989-06-15 |
NL7614292A (nl) | 1977-06-28 |
FR2336825B1 (nl) | 1983-01-28 |
JPS5931306B2 (ja) | 1984-08-01 |
FR2336825A1 (fr) | 1977-07-22 |
CA1097401A (en) | 1981-03-10 |
NL189891C (nl) | 1993-08-16 |
US4208706A (en) | 1980-06-17 |
DE2658903A1 (de) | 1977-07-07 |
NL189891B (nl) | 1993-03-16 |
GB1558831A (en) | 1980-01-09 |
AU508056B2 (en) | 1980-03-06 |
JPS5278052A (en) | 1977-07-01 |
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